Rotary crude oil burner



Dec. 13, 1938. MOTLEY ROTARY CRUDE OIL BURNER Filed April 4, 1935 Patented Dec. 13, 1938 UNETED STATES PATENT OFFICE Application April 4, 1935, Serial No. 14,723 In Great Britain April 6, 1934 3 Claims.

This invention relates to rotary crude oil burners and has for its object to provide a burner of increased efiiciency, and of the kind having a rotary conical atomizer.

The burner is of the type having an oil tube extending axially through the apparatus in which the supply of air to the atomized oil leaving the cone is delivered over the end of the conical nozzle by a fan, and according to the present invention such air supply after being drawn in through the central portion of the back of the fan casing passes through the fan casing, there being provided at the opposite or front side of the fan casing stationary curved blades arranged to direct the air inwards and towards the nozzle an then outwards over the end of the atomizing cone in the reverse direction of rotation to it to atomize the oil film leaving the conical nozzle.

The invention is illustrated by the accompanying drawing in which Figure l is a partly sectional general view of the device, Figure 2 a view of the fixed air blades and Figure 3 an end view of a cap fitting on the end of the central oil tube. In this drawing a is the central hollow feed shaft or tube which rotates with the rotary element of the fan I). The oil tube a at its end remote from the fan 17 rotates over a fixed oil supplying tube 0. The oil supplying pipe is fixed in outlet member pl of a pump 10 and extends along the bore of the rotary oil tube a the part within the tube being provided with a screw thread or spiral groove al of square section on the outer surface of which the oil tube a rotates. The pitch and direction of the spiral groove are arranged to return oil tending to escape along the fixed tube 0, to the rotary tube a.

The other end of the oil feed shaft a is fixed in the rear end of a conical atomizer d by a cap nut all which screws on the end of the tube a and engages the inner end of the conical atomizer d and so holds it on the tube a.

The cap nut oil is provided with oppositely disposed holes (12012 drilled in the cap nut dl other than radially and arranged to deliver oil on the inner surface of the conical atomizer (1, when fed therethrough by the oil pump 10.

The hollow oil feed shaft a has preferably a taper bore the larger end being in the conical atomizer.

The oil feed holes d2d2 rotate with the fan and operate as a centrifugal thrower tending to create a partial vacuum in the shaft a and thereby preventing oil working back past the stationary feeder e at its inlet end, and so on for instance to the gear box of the oil pump.

In the present invention, instead of bringing the air axially to the free end of the conical atomizer d as done heretofore, the atomizing of the oil is improved by feeding the air at a more or less steep angle to the outer plain cylindrical side of the conical atomizer d through a conical outlet bl. The conical outlet bl comprises a conical nozzle of gradually reducing outlet screwed into the outlet 113 of the fan casing 11.

On the inner wall of the front side of the fan casing b are stationary blades D2 which in elevation have portions curved in opposite directions as shown in Figure 2 and direct the air along the outer surface of the conical atomizer (1 through the nozzle b3 and over the edge of the atomizer d into the oil atomized by the atomizer d. At their outer ends the fixed air directing blades b2 extend around a disc b4 and the rotary blades b5 carried thereon and the disc lad is fixed to a flange bl on the sleeve b6 which is held on the oil tube a by the cap nut dl.

The outer portions of the stationary blades D2 in the outer portion of the fan casing b are inclined or helical to induce a current to the inner portions of the stationary reversing blades b2 feeding to the atomizing cone, and so overcome the resistance to the air current offered by centrifugal force in the outer portion of the fan casing. The oil tube a carrying the sleeve 17%, disk b4 and rotor blades 175 of the fan is driven by any suitable power such as by an electric motor J.

The atomizing cone and fan mounting may be constructed as far as possible of one piece to ensure truth and ease of assembly.

What I claim and desire to secure by Letters Patent is:--

1. In a rotary liquid fuel burner, a tubular atomizer chamber having its front end open, means for feeding fuel into said atomizer chamber, an annular wall mounted on, and extending outwardly from, the rear end of said atomizer chamber, a second annular wall extending outwardly from the front end of said atomizer chamber with a clearance in between, means for causing a stream of air to flow inwardly between said walls so that it impinges against the outside 'of said atomizer chamber and passes over the of said atomizer chamber.

2. In a rotary liquid fuel burner, a rotary tubular atomizer chamber having its front end open, means for feeding fuel into said atomizer chamber, an annular wall mounted on, and extending outwardly from, the rear end of said atomizer chamber, a structure defining a space surrounding said chamber and annular wall, said structure comprising a second annular wall extending outwardly from the front end of the atomizer chamber with a clearance in between, fan blades mounted on the rear side of the first annular wall for causing a stream of air to fiow inwardly between said two walls so that it impinges against the outside of said atomizer chamber and passes over the edge of said atomizer chamber at the outer end thereof, and fixed vanes extending substantially between said two walls and, at their outer ends, extending over the edge of the first wall to a position immediately outside the fan blades.

3. In a rotary liquid fuel burner, a rotary tubular atomizer chamber having its front end open, means for feeding fuel into said atomizer chamber, an annular wall mounted on, and extending outwardly from, the rear end of said atomizer chamber, a structure defining a space surrounding said chamber and annular wall, said structure comprising a second annular wall extending outwardly from the front end of the atomizer chamber with a clearance in between, fan blades mounted on the rear side of the first annular wall for causing a stream of air to fioW inwardly between said two walls so that it impinges against the outside of said atomizer chamber and passes over the edge of said atomizer chamber at the outer end thereof, and fixed vanes extending substantially between said two walls and, at their outer ends, extending over the edge of the first wall to a position immediately outside the fan blades, said .vanes being of 8 formation, having their inner ends directed to cause air to strike the atomizer chamber in a direction approaching the tangential to the surface thereof, and the outer ends directed oppositely to their inner ends LEWIS MO'I'LEY. 

